With each model year, the Shelby Mustang developed a slightly different personality. The 1965s were purely menacing, while the 1967 GT500s 428 with dual Holley 4V carburetors were ballistic while the GT500KRs featured the venerable 428 CJ. Not to be forgotten are the GT350s with their 289K power plants and the 1969 GT500 Super Cobra Jets. . .and the list goes on.
The original Shelby GT350s were the baddest ones of the bunch.